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For certain repairs (e.g. hard drive), disconnecting the battery connector is not necessary but it prevents any accidental shorting of electronics on the motherboard. If you do not disconnect the battery connector, please be careful as parts of the motherboard might be electrified.

Use the edge of a spudger to pry the battery connector upwards from its socket on the logic board.

It is useful to pry upward on both short sides of the connector to "walk" it out of its socket.

One point that I thought would help others trying this for the first time is about the mechanism holding the RAM. As the guide points out, the RAM chips should 'pop' up when the clips holding them down are properly extended to the side. And when installing the new chips I found that though the force applied was between light and moderate, relative there wasn't much force needed to insert them into the board as there was to push them downwards until you here a 'pop.' The force needed to be applied at any stage of the whole process was minimum to midway between minimum and moderate.

Hey I consulted this iFixit guide, the official guide on the apple website and also the crucial memory selector tool.

1) Apple said you didn't have to disconnect the power. So you don't (if you're just swapping out the ram).

2) Crucial confirms that 16 gb works. I ended up getting 16 gb of PNY at BestBuy. They didn't have any Crucial on the shelves.

3) The first two times I did this, the connections weren't perfect. So I had the triple beep motherboard error and then the "nothing happens when i try to power on" error. So if either of these happens, fret not. Just calmly open everything back up and do it again.

So happy I did this. Yosemite was a memory guzzling beast. Now I have garageband and iTunes and iPhoto all blazing and not a hitch.